If you can't wait anymore, you can sell it now as long as it has given you a profit. Then you can invest it in more promising coins. But, if you plan to hold it for a long time it doesn't matter either, we won't know what happens in the future. Maybe the coin could soar.
If you don't know what conditions will happen in the future, then it would be better to put your investment in coins that already have a good rating, large volume and lots of fans because it saves one's assets more for greater losses, because coins that already have that kind of power will usually always recover faster under any circumstances.